Collapse assessment of steel moment frames based on E-defense full-scale shake table collapse tests / Dimitrios G. Lignos in Journal of structural engineering, Vol. 139 N° 1 (Janvier 2013)  

Public ISBD [article]  inJournal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 120–132 Titre : Collapse assessment of steel moment frames based on E-defense full-scale shake table collapse tests Type de document : texte imprimé Auteurs : Dimitrios G. Lignos, Auteur ; Tsuyoshi Hikino, Auteur ; Yuichi Matsuoka, Auteur Année de publication : 2013 Article en page(s) : pp. 120–132 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Collapse Component deterioration Full-scale collapse tests Steel structures Local buckling Strong-column/weak-beam ratio Exposed column bases simulation Sidesway Résumé : This paper presents key parameters that affect numerical modeling of steel frame structures for reliable collapse simulations. The collapse assessment is based on experimental data obtained from a full-scale shaking table collapse test of a 4-story steel moment frame and a blind numerical analysis contest that was organized in parallel with the collapse test. It is shown that (1) there is no clear advantage between three-dimensional (3D) and 2D analyses in the prediction of a sidesway collapse mechanism for buildings with a regular plan view as in the case of study; (2) the assumption of Rayleigh damping leads to better predictions of structural response compared with stiffness proportional damping; and (3) accurate prediction of collapse necessitates that P-Δ effects always be considered in the analysis. It is also proven that accurate simulation of steel component deterioration is a key factor for reliable prediction of collapse behavior. On the basis of a synthesis of experimental and analytical studies, a few collapse mitigation alternatives are investigated. In particular, the effects of the strong-column/weak-beam ratio and exposed base plates on the collapse capacity are assessed. It is notable that a combination of bending strength increase and delay of local buckling in first-story columns is most effective for the enhancement of seismic performance against collapse. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000608 [article] Collapse assessment of steel moment frames based on E-defense full-scale shake table collapse tests [texte imprimé] / Dimitrios G. Lignos, Auteur ; Tsuyoshi Hikino, Auteur ; Yuichi Matsuoka, Auteur . - 2013 . - pp. 120–132. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 120–132 Mots-clés : Collapse Component deterioration Full-scale collapse tests Steel structures Local buckling Strong-column/weak-beam ratio Exposed column bases simulation Sidesway Résumé : This paper presents key parameters that affect numerical modeling of steel frame structures for reliable collapse simulations. The collapse assessment is based on experimental data obtained from a full-scale shaking table collapse test of a 4-story steel moment frame and a blind numerical analysis contest that was organized in parallel with the collapse test. It is shown that (1) there is no clear advantage between three-dimensional (3D) and 2D analyses in the prediction of a sidesway collapse mechanism for buildings with a regular plan view as in the case of study; (2) the assumption of Rayleigh damping leads to better predictions of structural response compared with stiffness proportional damping; and (3) accurate prediction of collapse necessitates that P-Δ effects always be considered in the analysis. It is also proven that accurate simulation of steel component deterioration is a key factor for reliable prediction of collapse behavior. On the basis of a synthesis of experimental and analytical studies, a few collapse mitigation alternatives are investigated. In particular, the effects of the strong-column/weak-beam ratio and exposed base plates on the collapse capacity are assessed. It is notable that a combination of bending strength increase and delay of local buckling in first-story columns is most effective for the enhancement of seismic performance against collapse. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000608

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